Plate Definition and 1000 Threads

As minor planet discoveries are confirmed, they are given a permanent number by the IAU's Minor Planet Center (MPC), and the discoverers can then submit names for them, following the IAU's naming conventions. The list below concerns those minor planets in the specified number-range that have received names, and explains the meanings of those names.
Official naming citations of newly named small Solar System bodies are approved and published in a bulletin by IAU's Working Group Small Body Nomenclature (WGSBN). Before May 2021, citations were published in MPC's Minor Planet Circulars for many decades. Recent citations can also be found on the JPL Small-Body Database (SBDB). Until his death in 2016, German astronomer Lutz D. Schmadel compiled these citations into the Dictionary of Minor Planet Names (DMP) and regularly updated the collection. Based on Paul Herget's The Names of the Minor Planets, Schmadel also researched the unclear origin of numerous asteroids, most of which had been named prior to World War II. This article incorporates public domain material from the United States Government document: "SBDB". New namings may only be added to this list below after official publication as the preannouncement of names is condemned by the WGSBN.

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  1. P

    2 parallel plate conducts and dielectric-pic included

    I uploaded the problem statement and the answer in the solution manual. I think the manual is wrong for Q2 which should've been (200V)kC2 not 200VkC1, right?
  2. K

    X and y coordinates, integration, semicircular plate (masteringphysics)

    Homework Statement Use equations x_{cm}=\frac{1}{M}\int x dm and y_{cm}=\frac{1}{M}\int y dm to calculate the x- and y-coordinates of the center of mass of a semicircular metal plate with uniform density \rho and thickness t. Let the radius of the plate be R. The mass of the plate is thus...
  3. jegues

    Dieletric Boundary Conditions (Parallel Plate Capacitor)

    Homework Statement See figure attached for problem statement, as well the solution. Homework Equations The Attempt at a Solution I'm confused as to how he is writing these equations from the boundary conditions. What I understand as the boundary condition for D is, \hat{n}...
  4. J

    Integral form of Gauss' Law, Parallel Plate Capacitor

    Homework Statement If one were to consider a parallel plate capacitor with a distance d between them connected to a battery and a vacuum space between the plates. Will the integral form of Gauss' Law to any closed surface between the plates that does not cross either plate hold? If not, what...
  5. M

    Finding Hydrostatic Force on the Plate

    Before I begin I would like to say hello to everyone. This is my first post. I will follow and abide by all rules here. Homework Statement A rectangular plate measuring 2m by 5m is suspended vertically in a liquid with density 500 kg per cubic meter in such a way that one of its longer sides is...
  6. D

    Definition of a baffled plate in the context of sound radiation

    Hi everyone, I've been reading quite a few papers on the study of sound radiation, and a common system that is studied is described as a "baffled plate". What exactly are the boundary conditions on a baffled plate? I thought it was simply that the edges have a pinned boundary condition, i.e...
  7. M

    Predicting adult height given current height, age and growth plate measurement

    I went to see an orthopedic specialist this year, when I was 15 years and 5 months old. I am 5 ft, 11 1/4 in. The specialist looked at my then-recent X-rays and I was not even halfway done growing. (I'm pretty sure I scored a 2 out of 5.) I am due for another X-ray sometime next year, at...
  8. A

    Create an expression for a rotating plate

    A flat, circular plate (mass Mp, radius Rp, thickness Tp) rotates parallel to the surface of the Earth on a frictionless axle. As it spins, a point on the top of the disc traces a circle each time the plate completes a rotation. in terms of the number of rotations per minute (N/min), create...
  9. C

    Finding the Centre of Mass of a 2D Plate

    Homework Statement Find the centre of mass of the 2-dimensional plate which occupies the region inside the circle x^2+y^2=2x, but outside x^2+y^2=1, and for which the density is proportional to its distance from the origin. Homework Equations Centre of mass for x coordinate: 1/m ∫∫ x ρ(x,y)...
  10. P

    Polarization: minimum thickness for quater-wave plate

    a certain bifringement material has indexes of refraction n1 and n2 for the two perpendicular components of linearly polarized light passing through it. the corresponding wavelengths are λ1=λ0/n1 and λ2=λ0/n2, where λ0 is wavelength in vacuum. If crystal is to function as a quarter-wave plate...
  11. P

    Polarization, minimum thickness of a quarter wave plate

    Homework Statement show that minimum thickness of quarter wave plate is d=\lambda0/4(n1-n2 Homework Equations \lambda1=\lambda0/n1 \lambda2=\lambda0/n2 The Attempt at a Solution for quater wave plates wavelengths must differ by 1/4 i can see its simple but i just can't see what...
  12. A

    Electric plate has three sections with equal resistivity

    Electric plate has three sections with equal resistivity. Those resistivities combined parallel - water boils per 6 minutes. How much time it will take to boil the same weight and same initial temperature of the water if we will combine resistivities sections like in A and C Thanks very much
  13. O

    How Long for Electric Field to Vanish in a Photoelectron-Irradiated Capacitor?

    Homework Statement The negative plate of a charged, isolated parallel plate capacitor with a vacuum gap of width d and carrying a surface charge density s is uniformly irradiated with a short pulse of ultraviolet light whose photon energy is just enough to release a photoelectron at the...
  14. E

    Electric field between point and infinite plate

    Dear all, I think I have an easy problem for you, however I get confused by the simplicity and complexity at the same time. Situation is like this: I have a point charge at a distance d from an infinite plate with thickness comparable to the distance d. Is there difference between the...
  15. C

    Flat Plate Heat Exchanger. Find average convection HT coefficient

    Homework Statement In this flat plate heat exchanger, rippled plates (0.3 m thick each) create channels that allow heat transfer between a hot and a cold fluid. Conduction occurs then from the heat temperature difference between the two fluids while convection occurs as the fluids move...
  16. S

    Minimun angular velocity for a wheel to maintain contact with a plate

    I guess point A is the origin of my stationary axis, with Y going up along AB, then X going along AC. My moving axes would be at the center of the moving disk at point C. So, the w of the small disk is induced by the Ω of the main shaft along AB. If the radius of the small wheel is r, then...
  17. T

    Lift, Drag, Normal, and Axial Forces on a Flat Plate

    Homework Statement Consider an infinite thin flat plate with a 1m chord at an angle of attack of 10 degrees in a super sonic flow. Describe the angle theta between the Lift and Normal Force, is it the same as the Drag and Axial? Homework Equations L=Ncos(a)-Asin(a) D=Nsin(a)+Acos(a)...
  18. B

    What is the Magnitude of the Electric Field Between Parallel Plates?

    Problem: Two square metal plates are placed parallel to each other, separated by a distance d= 1.56 cm. The plates have sides of length L = 0.560 m. One of the plates has charge Q= + 1.74×10-6 C, while the other plate has charge -Q. Calculate the magnitude of the electric field between the...
  19. M

    Center of mass to find support reactions at pins for a homogeneous flat plate

    Homework Statement The mass of the homogeneous flat plate is 50 kg. Determine the reactions at the supports A and B. I've attached the diagram. The Attempt at a Solution I know I will need to find the center of mass. I don't remember exactly how to do it, but I found the centroid...
  20. P

    The force of magnitude F acts along the edge of the triangular plate

    Homework Statement I attached the drawing. The force of magnitude F acts along the edge of the triangular plate. Determine the moment of F about point O. Homework Equations M=rxF The Attempt at a Solution What I did was I just picked the top left point of the triangle and labeled...
  21. M

    Value of fracture toughness for a finite plate

    Hiii heeeeeelp please. I am new here and hope to find a solution and an easy to understand explanation to my problem:confused:. Thank you all :smile: a. A specimen corresponding to a finite plate of width W = 65 mm is made from a steel with a yield strength of 650 MN m^-2 and contains an edge...
  22. L

    What is the Charge on the metal plate?

    A metal plate is connected by a conductor to a ground through a switch. The switch is initially closed. A charge of +Q is brought close to the plate without touching it, and then the switch is opened. After the switch is opened, the charge +Q is removed. What is the charge on the plate then...
  23. C

    Real world prob: bending of 26mT circular plate

    Hello all, I'd like to check my work on this to make sure a safe lift is done. We have an 11m diameter, 35mm thick, 26mT circular steel plate to which we will add two trunions at the ends. The circular plate is welded in 4 parts and once we weld one side we have to flip to weld the other. That...
  24. N

    Photons observed on photographic plate - but not in eyes? Why?

    Hey, We can observe the build up of photons on a photographic plate, but we can't observe this build up with our bare eyes. i.e. without needing a photographic plate - just by looking like how we look right now. how come?
  25. A

    Question regarding parallel plate capacitor

    Lets assume that there is a parallel plate capacitor connected across a supply of V volts. Then, there is charge redistribution between the plates such that finally the potential of positive plate wrt the negative plate is V volts. Let us assume air is the dielectric between the two plates. Now...
  26. B

    Solving Parallel Plate Capacitor Pendulum Oscillations

    1. Homework Statement PLEASE DO NOT DELETE THIS POST, MODS, IT MAY LOOK LIKE THE SAME QUESTION AS BEFORE, BUT IT IS NOT, IT IS A TOTALLY DIFFERENT PART TO THE QUESTION. consider a parallel=plate capacitor with square plates of side L and distance d (<<L) between them, charged with charges...
  27. A

    Flat Plate Deflection & stress - HDPE

    Hi, I'm trying to carryout some analysis of flat plates subjected to hydrostatic water pressures however the plate material is HDPE. The problem I'm having is that all the formulae on the web and in Roark's 7th Edition are typical of steel with a Poisson's ratio of 0.3. I can't therefore...
  28. E

    Plate heat exchanger design help

    HHi all, I'm working on spiral/plate heat exchanger design and the temperature difference is to be 400c. I need some one to guide me through it. Thanks
  29. C

    Find the E field of a parallel plate capacitor tilted at 45 degrees

    Homework Statement Find the E field of a parallel plate capacitor tilted at 45 degrees from vertical and moving at a speed v. each plate has plus or minus \sigma_0 for charge density. The Attempt at a Solution Well the E field in rest frame would be E= \frac{\sigma_0}{\epsilon_0}...
  30. R

    Vanity Plate Ideas - Get Creative & NERDY!

    Hey Everybody! I am getting a vanity plate and I want it to be NERDY! I'm thinking about something along the lines of math, computer science, or electricity (especially lighting). Must be 7 characters, numbers and/or letters. Some ideas I have: SUDO GO, FF0000, 186KKMS .... Got any...
  31. H

    Difference between a clamped and a simply supported plate.

    Hey, I've recently been taking a look at the theory of plate vibration, but I can't seem to find anywhere an exact definition of what consitutes a "clamped" and a "simply supported" plate. What exactly are these, conceptually and mathematically?
  32. D

    Do sound vibrations from plate tectonics (earthquakes) attract asteroids?

    I'm not sure whether to put this in Earth or Astrophysics. How far would these sound vibrations/waves travel? Do they just stay within the Earth, or is it possible for them to travel through space; and if so, how or why or is it possible for these vibrations to attract asteroids?
  33. P

    Finding an kinetic energy of an electron moving to a positive plate

    Homework Statement 2 part problem. I've already solved the first part. Two parallel plates are held at potentials of +380.0 V and -150.0 V. The plates are separated by 3.00 cm. a. Find the electric field between the plates. b. An electron is initially placed halfway between the...
  34. K

    Question about dynamic pressure vs pressure on plate

    Dynamic pressure, from Bernoulli's principle, for a moving fluid with a given density is P = \frac{1}{2}\rho {v^2} On the other hand, we can compute the force on a plate hit by that fluid from the rate of momentum transfer. Assuming that the fluid exits sideways after impact, we have...
  35. hanley93

    About Electrostatic Forces on Parallel Plate Capacitor

    I've been thinking about this for a while, and I think people of PF will be able to answer it haha In parallel plate capacitor, we charge the capacitor by connecting a power supply/battery. Then, after few minutes, the capacitor is fully charged with different signs, + and -. With that...
  36. B

    Calculating Orifice Profile and Plate Thickness for 48" Pipeline

    We have a situation where we have air in front of the dry pigs and need to control the pig speed Medium is air, pressure is 17 barg upstream and 0.2 barg downstream and pig speed target is O.5 m/s for the pig in the 48" pipeline with a pressure of 17 barg. need to find the following...
  37. A

    Calculating Energe stored in a Parallel Plate Capacitor

    The left plate of a parallel plate capacitor carries a positive charge Q, and the right plate carries a negative charge -Q. The magnitude of the electric field between the plates is 100 kV/m. The plates each have an area of 2 × 10-3 m2, and the spacing between the plates is 6 × 10-3 m. There is...
  38. C

    Plate cantilever stress and force theory

    Hi all, I have a cantilever that is a plate (not a beam) with dimensions 2mm wide x 4mm long x 0.3mm thick. It is fixed only at one side, with the other 3 sides free. I want to be able to find the intrinsic stress on it after it is fabricated. To complicate matters, I also want to put...
  39. L

    Calculate the temperature on the other side of the plate.

    Hello, I need some help in a matter. I don´t have any great knowledge in thermodynamics. If I have a plate of stainless steel (2mm thick). On one of the sides of the plate the temperature is 400C. I need to have a "simple" derivated calculation regarding how much the temperature is on...
  40. O

    Bending of a parabolic plate with some thickness

    Hi, I am trying to obtain a relation for calculating the deflection of a parabolic plate of thickness (say 't') clamped at one end, with a concentrated load along the center line at the "apex" end. Any direct links for the formula? Thanks!
  41. N

    Calculating Contact Force & Plate Stiffness of Composite Laminated Plate

    hi.. This is abdul I am carrying a impact of sphere on a composite laminated plate. i wanted to calculate the contact force when sphere impacts the plate.. or can anyone help me how to get the stiffness of plate.. or deflections in plate.. with respect to time Thanking you Your help will...
  42. H

    Fluid dynamics (2nd year undergrad) question on jet incident on a plate

    Homework Statement A circular jet of water of radius r1 is propelled vertically downwards and hits a circular plate of radius r2 (> r1 ) so that the centre of the jet is incident onto the centre of the plate. The velocity of the jet as it hits the plate is v and is normal to the plate...
  43. C

    When did plate tectonics begin?

    When did plate tectonics begin? The early Archean was essentially shallow seas, salty water early on from rifting, shield volcanoes (no sticky silicates, since no oxygen) etc. There were no deep oceans, no mountain building, no continents, since there was no plate tectonics. One could still have...
  44. E

    Not-So-Parallel Plate Capacitor

    1. You have fabricated a parallel plate capacitor in your work shop, but the square metal plates end up not being exactly parallel to each other. They form an angle \alpha. The plates, size L, are held at constant electrical potentials, V1 and V2, corresponding to an electrical potential...
  45. A

    Force on a plate due to air jet

    Suppose there is a plate with area A, on which jet of air with velocity 'v' is striking, then force on it will be = (density) * A* v^2 But if we go by basics i.e. F = d(mv)/dt = v d(m)/dt + m d(v)/ dt here i am not able to figure out that why the second term i.e. m d(v)/ dt is zero...
  46. C

    Linearly polarised light through half and quarter wave plate

    Homework Statement A half wave plate and a quarter wave plate are placed between a Polariser and an analyser .All of these are parallel to each other and perpendicular to the direction of propagation of unpolarised incident light.The optic-axis of the half-wave plate makes an angle 300 with...
  47. E

    How would you calculate plate thickness and width when you know

    Shear stress of bolts Diameter of bolt Shear stress of plate Load carried Bearing stress of plate Bearing stress of bolts If someone could help me it would be fantastic Thanks
  48. D

    Force acting on a flat plate that is moving trough fluid

    soo as the title says, i need formula for force acting on a plate that is moving trough fluid, in my case air... need it for rocket simulation because of its flat stabilizers... i thought like this: a flat plate is moving in any direction (yeah that complicates things... but keep it...
  49. N

    Two circular discs spaced apart from a parallel plate capacitor ?

    Homework Statement Two circular disks spaced 0.50 mm apart from a parallel-plate capacitor. Transferring 1.90 x 10^9 electrons from one disk to the other causes the electric field strength to be 1.90 x 10^5 N/C. What are the diameters of the disks (in cm)? Homework Equations E = Q /...
  50. S

    Moment of inertia for rectangular plate

    Hi! I've got a problem with this: Count moment of inertia for rectangular plate a x b, if you know that moment of inertia of thin rod is \frac{1}{12}ml^2 . Do not use integrals!, others mathematical functions required (I can proof this moment by integrals, but this is not issue). I know that...
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